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[ms2000]

Further to my last post, it seems that the (new NTK) O2 sensor is not seen to be responsive enough as per the Scanner.
Could this be ECM?

[ms2000]

These are more accurate desc of the issue:
– When I am not accelerating while driving, the STFT shoots up
– When the car is idling, the STFT slowly creeps up

So the car earns the P0171 CEL at idle
When driving steadily, CEL goes off.

Does this tel anything?

[ms2000]

It has a MAP sensor
No EGR

[ms2000]

So I asked the shop He said rich condition was there by looking at LTFT/STFT.

Fast forward, he found P0304 was caused by a bad injectors. And Fuel pressure/Regulator were fine.
So used a reman 4 injectors and misfire is gone.

After coming home, I noticed LTFT was quite high at 14.
Today I changed engine oil and within about 3-4 miles of driving, it gave P0171. It happened around 2900rpm.
Coolant at 172, MAP 10.15psi, LTFT = 19, STFT= -0.78, 26.7mph
Load = 69%

Could PCV be the culprit? The PCV hose is also stiff. But shop found issue on IACV gasket – so they would have checked for leaks. Only reason I asked because of oil change.

Car runs fine – no hesitation even with the code.
Any advice?

[ms2000]

Thank you for being spot on.

There was air leak around the IACV – M/c fixed it. Now its on Rich condition.

Last yr, AC would not work on idle – it turned out to be IACV was clogged. It was cleaned and everything worked fine.

O2 sensor, Plugs, are new.
Thoughts?

[Author]

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